LG released 100 helium balloons, each with a free smartphone voucher, at the so-called G in the Cloud event, which took place in an outdoor park in the South Korean capital city. The phones, which sell for KRW 950,000 in South Korea ($851; £550), would be given to people in possession of the voucher, the company said.

Customers arrived with BB guns to shoot down the balloons and surged forward when they were released.